问题
选择题
____________ at college for 3 years, she knows the place very well.
A．To have studied
B．Having studied
C．Studying
D．Studied
答案
答案：B
考查非谓语动词。句意：在这所大学学习了三年，她非常了解这个地方。现在分词做状语表示主语正在进行的伴随性动作，和句子主语是逻辑上的主谓关系。如果分词动作发生在主句谓语动词之前，则要用完成时态的过去分词。故选B。